Hybrid photonic chips that convert the colour of light

In a silicon nitride ring resonator embedded in silica, the light uses both materials at once: Raman scattering in the silica cladding and four-wave mixing in the silicon nitride core together produce broad frequency combs spanning more than 400 nm. Arghadeep Pal, Alekhya Ghosh and colleagues report the results in Advanced Photonics.
➔ Advanced Photonics 8, 046008 (2026)